B0500T Equivalent & Substitute Parts

Part Overview

The B0500T is a 500mA 600VAC board mount surface mount fuse manufactured by Bourns Inc. under the Telefuse™ series. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and procurement planning. The part is designed for telecom applications requiring reliable overcurrent protection in surface mount configurations.

Substiute Parts

B0500T

Bourns Inc.In Stock: 3647B0500T Datasheet

Current PartRFQ

SF-3812TM050T-2

Bourns Inc.In Stock: 2816SF-3812TM050T-2 Datasheet

DirectRFQ

0461.500ER

Littelfuse Inc.In Stock: 198420461.500ER Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the B0500T are identified based on the following critical parameters that determine functional equivalence:

• Current Rating: 500mA (exact match required)
• Voltage Rating - AC: 600 VAC (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

The two substitute parts listed below meet all mandatory electrical and mechanical parameters. Variations in DC voltage ratings, response time characteristics, and DC cold resistance do not preclude substitution when AC voltage and current ratings are identical and the physical package is compatible.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with current manufacturing status, addressing the obsolescence of the B0500T. Selection between SF-3812TM050T-2 and 0461.500ER should be based on the following factors:

SF-3812TM050T-2 (Bourns Inc., SinglFuse™ SF-3812TM-T series) maintains manufacturer continuity with the original B0500T and carries UL approval. This part provides 250V DC rating capability and is available in active production with 2776 units in stock.

0461.500ER (Littelfuse Inc., Telelink® 461 series) offers dual certification (CSA and UR) and is available in higher inventory (19770 units in stock). This part provides 80V DC rating and is suitable for applications where cross-manufacturer qualification is acceptable.

Both parts are ROHS3 compliant and operate across the identical temperature range. Physical dimensions show minor variations within typical manufacturing tolerances for the 2-SMD, Square End Block package format.

Frequently Asked Questions (FAQ)

Q: Can SF-3812TM050T-2 or 0461.500ER be used as direct replacements for B0500T?

A: Yes. Both substitute parts match the critical electrical parameters (500mA current rating, 600VAC voltage rating) and mechanical specifications (2-SMD, Square End Block package, surface mount configuration). All three parts operate across -55°C to 125°C.

Q: What are the physical dimension differences between these parts?

A: The B0500T measures 0.380" L x 0.120" W x 0.120" H. Both substitutes measure approximately 0.398" L x 0.122-0.123" W x 0.122-0.123" H. These minor variations are within standard manufacturing tolerances for this package type and do not affect PCB footprint compatibility for 2-SMD, Square End Block designs.

Q: How do the DC voltage ratings differ?

A: The B0500T does not specify a DC voltage rating. SF-3812TM050T-2 is rated for 250V DC, while 0461.500ER is rated for 80V DC. For AC-only applications, both substitutes are functionally equivalent to the original part.

Q: What is the significance of the different Melting I²t values?

A: Melting I²t indicates the thermal energy required to melt the fuse element. B0500T has 2.3, SF-3812TM050T-2 has 1.4, and 0461.500ER has 0.84. These differences reflect design variations in fuse element construction and response characteristics. Both substitutes are rated for the same 500mA current and 600VAC voltage, confirming their suitability for the application.

Q: Are there approval agency differences I should consider?

A: B0500T carries UR approval. SF-3812TM050T-2 carries UL approval. 0461.500ER carries both CSA and UR approvals. Selection should align with your system's certification requirements.

Q: What is the packaging difference between these parts?

A: B0500T is available in standard packaging. SF-3812TM050T-2 is supplied in Tape & Reel (TR) format. 0461.500ER is also supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for high-volume surface mount assembly operations.